Power hammer



J. SACK POWER HAMMER July 9, 1935.

Filed June 1, 1953 2 Sheets-Sheet l J. SACK POWER HAMMER July 9, 1935.

Filed June 1, 1955 2 Sheets-Sheet 2 Patented July 9, 1935 l ,UNITED n vfs-MTES oFFIcE vill/IV irventionirelates to'certain'new and use- VHful `improvementsfin power driven hammers for -various uses and purposes` and the-invention has rioranobject to provide a Very simple and inexpensiveconstruction which will readily and efffectively serve its intended purposes.Vr

Further, the invention has for an object to j providea beamhammer, the ,strokes of which mayleasily be adjusted for thicker or thinner :Workif M. .w --Furtheryit-is an objectyto` provide a power :hammer in which the hammer `proper is so mounted as toy avoidsideiriction such as isusual- `j ly-causedby the' use of short connectingrods.)

jhammer inwhich the hammer properis supportyfled*,on"balanced or equalized pressure armswith "whichtheconnecting rod from the crankshaft mer 4todampen theA rebound shocks `on ythe hamm erreciprocating mechanism.

@Furtherfit is an object to provide a power hammer andY anvil cooperating therewith .whose impacting dies are removable.

Other objects will in part be obvious and in part be pointed out hereinafter.` v

To the attainment of the aforesaid objects and ends, the invention still further resides in the novel details of construction, combination and arrangement of parts'all of which will be rst fully described in the following detailed description, then be particularly pointed out inthe appended claim, reference being had to the accompanying drawings, in whichz- Figure 1 is a front elevation of the invention.

Figure 2 is a side elevation thereof.

Figure 3 is a horizontal section on the line 3-3 of Figure 2.

Figure 4 is a detail elevation of a modied construction of hammer carrying lever device.

Figure 5 is a similar view of a further modication.

Figure 6 is a detail perspective view of the hammer carrying lever guide or cross head.

In the drawings in which like numerals of reference indicate like parts in all of the gures, I represents a suitable base from which v'extends upwardly a pair of side plates 2 and at a suitable distance from the base there is located between the side plates an anvil post 3, the same being secured to the side plates by crossbolts 4.

Angle irons 5 are riveted at 6 to the upright side plates 2 and are connected by bolts 1 to the base I.

On suitable angle iron brackets 9, bolted at II laldglebrackets 9. y `"The"crank'rshaftV I2 carries a-fly wheel I3. There is yalso a drive pulley I4 rotatably mount- `5 connecting rod 23 as' shown. `joined, therebyyieldingly mounting the ham- 'to the? side platesz, are bearings fr the crank VshaftIZ, the bearing 8 being bolted at IU tothe ed en the crank shaft by means of suitable thrust and; anti-friction bearings l5, the pulley lll-having' aclutch facev I6 to cooperate with the` shift- 7Aable clutch I1' that lis keyed vto the crank shaft 5 Aand'is provided `with a shifting collar I8 tobe -10 engaged by the lfork' ofthe clutchfshifter'bell ficrank I9? 4*The clutch is kept out of engagement normallyV by a pull back or clutch throw-out l spring 2`4operating via the lever I9; The lever "Further, it is yan object "to provide ajpo-wer I9 is Amounted Von a suitable bracket 20 and is f5 pivtedfthereto at 2I.v It may be operated to throw inthe clutch by means of au pedal 22 yand 251is the connecting rodlbetwreen the-crank of the crank shaftand thefcross head' `Sli-of 'the 20 hairriercarrying spring leverdevice.Y The` lower endilofl'the connecting rod 25 hasa bearing 21 of the crank shaft. The connecting rod 25 has its 30 ends bent so that the main part of the rod may lie to one side of the center line of the hammer and anvil as best indicated in Figure 2. Where the connecting rod 25 passes through the rearplate 29 that plate is vertically slotted as at 38,.

The rod 25 may be made in two lapped sections, if desired, joined together by bolts passing through certain ones of a series of bolt holes in the lapped ends as at 26,see Figure 2.

28 designates the front hammer guide plate and 4.0 29 indicates the rear hammer guide plate, which plates are mounted as at 30 and 3| to the side plates 2 and they are provided with V-shaped `vertical guide grooves 32 and 33 lrespectively in slots pass the forked rods 41, having threaded ends 50 for the reception of the bearing blocks 46 and the jam nuts 5|, the bearing blocks 46 being convex to fit the concave lower ends 45 of the levers 40.

The rods 41 have their forks 48 pivoted at 49 to the hammer proper 52. It will be seen that the weight of the hammer which would tend to draw the lower ends of the levers 40 together, is counteracted by the spring unit 42 so that under normal conditions the rods 41 lie substantially horizontal or in alignment with each other.

53 is the removable anvil die and`54 is the removable hammer die, these dies being held in dove-tailed slots in the respective members that carry the same.

'Ihe cross head 55 (or 56 as the case 1may be) is provided with bearing wings 39 to engage in the slots 34 with the rear edge of thesupport.

56 designates a modified cross head tOtake the place of the head 55, it having ears 51 to which the .upper end of theconnecting rod may be pivoted, and itfcarries apair of levers`58 between which is located a pull spring unit59 whose ends 66 are connected to the levers and tend to force the lupper ends together andl consequently force the lower ends apart.

In Figure 5 is shown another modification in which the levers 60 are pivoted togetherat 6I and l.carrying bearing ears 62 for connection with the connecting rod 25, this form also employing va lpush spring like the spring 42.

The manner in which my invention operates is Las follows:

Upon throwing in the clutch `the crank shaft will be turned rapidlyY (in practice about,400 to 450 revolutions per minute) thereby effecting a reciprocation of the hammer proper, causing it to strike the work. The rebound shocks of the hammer on striking the work are compensated for or absorbed by the spring 42 so that the rebound shocks are smoothed out before being transmitted to the connecting rod 25.

The arms 60 are provided with a series of recesses 59a in which the lugs 59h may be located at different distances from the center 6| to allow `for adjustmentof the stroke.

From the foregoing description, taken in connection with the accompanying drawings, it is thought the complete construction, operation, and

` .advantages of my invention will be clear to those ,directly above the 4crank shaft, hammer guide- `ways .on .the support, a .hammer proper slidable toward Aand from the anvil `unit in said guides provided above the anvil, a connecting rod between .said crank shaft and said hammer proper for reciprocating the hammer proper, said connecting 4rod lying, to one side of said anvil and hammer and having offset portions, the ends of which line up with the vertical axis of the anvil and hammer, said connecting rod being composed of .two sections `adjustably connected together for lengthening ,and shortening the same, and a flexible connection between said connecting rod and said hammer proper, said flexible connection Acomprising across head, lever members mounted on said .cross head, said lever members having upstanding arms, spring devices adjustably mounted .on .said upstanding arms for adjustment toward and from the pivots of said lever ,memberaand connecting bolts between said lever A members and said hammer proper.

. J OHN SACK. 

